Here ya go!
I have always thought that bi-amping or tri-amping with a fully adjustable high quality active crossover was a far better solution than tone controls. It;s just not doable with most systems, or prohibitively expensive.
Speaking for myself, I really only use tone controls (if I have them) at low volumes. Most of the time, flat is where it's at. Otherwise, adjusting speaker positioning, dealing with room reflections and sitting in the sweet spot are the way to go.